Question about Cobra 29 LTD CB Radio

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Increase the output power

Could you help me . iwant to increase the output power of (sailor rt2048 VHF radio) .(s.p. radio a/s)

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What is the video single output VHF FM UHF 12db


That sounds like the description of a broadband amplifier. It likely has "F" type (cable-coax) connectors and a power cord.
Commonly used to increase the signal level of TV cable to compensate for inserting a signal splitter, or in some cases to increase the signal level from an antenna, typically outdoor TV or FM radio antenna, so it is connected between the signal source (antenna, or cable) and receiver with antenna as input and receiver connected to the output of this little box. The gain (amplification) it provides is 12 dB, so the output is more than 3 times the input.

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There is a good review of LED lighting in a recent issue of Practical Sailor. RF noise is an issue with some off brand LED lighting.

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VHF/UHF RF Power falls to Zero when the Auto ATU tunr logo is on the display. When the tunr logo is off the VHF/UHF RF power is only 10 watts on 2M and 3 watts on 70cms. The Yaesu FT 857 D should have no...


Check for open or shorted Veractor diodes and steering diodes there may be no direct interaction as you say but if a diode is open or shorted the RF circuits might still be selected for the higher bands and the lower output power on your vhf/uhf is an indication of this.
If you do not have a service manual you can get one hear, you will likely kneed one
http://www.tradebit.com/filedetail.php/127575994-vertex-yaesu-ft-857-ft-857d-2005-service-repair
Good Luck Best regarsds Falco

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Check PTT switch is working? if working then check power output of your radio. if no power then change PA.

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no need to increase power output. you can take a radio with 100 watts and a radio with 10 watts that had had a modulation kit installed and the 10 watt radio will out talk the 100 watt radio ALL day long. the best thing to do would to put a mod kit in it and have the dead key cut back to 1/2 watt then put as little amp behind it. with those mods it will be loud and clear. hope that helps

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You can find a helpful guide at the following link:
http://www.boatsafe.com/nauticalknowhow/...


Have fun!

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Hi, It is not typical but neither is there a problem with the radio. Transmit Power output is loosely dependent on the: 1. Frequency or channel you are transmitting. Normally, Marine Band VHF are calibrated for max (25 in your radio) at Ch16 or 156.800Mhz; 2. If the SWR of the antenna is not a flat 1.0, power tends to go down; 3. After some time, the TX side of the radio needs to be re-calibrated; 4. Power Supply - some radios will push max output only when powered with 13.8 and tends to go down when used with 12 volts. Hope this be of some help/idea. Post back should you need additional information. Good luck and kind regards.

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